Malicious PDF — malware analysis report

Static analysis result for SHA-256 28736664d510fc4c…

MALICIOUS

PDF

126.5 KB Created: 2021-06-25 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6c70a90bbad8d7a70c071d4bfc015abd SHA-1: 12b35b55cc8da9af7aa41f278fdd6bf1f52cb709 SHA-256: 28736664d510fc4c1c5140658d0be715cb42b4fca100e804e7f39420bb068ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, many of which host other malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=the+aim+and+structure+of+physical+theory+pdf PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4adbd071e7---pageziteduvigetasuv.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/japovig.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wawof.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070620a03bb4---44779964716.pdfIn PDF document text
    • https://edarky.net/data/file/zasaviriluzazer.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096cbfadeb5c---mifufufedepozugafopevireg.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/64897402562.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/35asfk5g9ia7hkgpg138oe0407/46600836156.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3adbd7c1---5587326996.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/f088dmcsej121kn16d6p6dtp35/fatep.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa939dbea2---70165952661.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6vp118v4gip81gle2gi2amjib8/70850783785.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f525aa141f---vegazafo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bdee4af23---82120500341.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429010444589142.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/bunewebajubek.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ovvqudal3qna75c912mbfsqp73/jugag.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/11054161441.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/24359166628.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/nvvu4dbk1b24thq94s4ob37g7g/zozetawu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0455d0e85---xumupoxerelilinem.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/hmr410biov8u8ivk8annit42pv/vawaluxeperikezib.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3A5 18016 bytes
SHA-256: e3763f3e2c392623ab0d15b5c964f7985e984ad86c9cfa8f7dad8296554eccb4
font_02_sfnt_off0001d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D11A 11064 bytes
SHA-256: f0ba534c47b6fc5e94c2b70294241e8570d557eda2ad62ba40936e26e1f63778

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